Now all modules are in core modules folder

modules/views/handlers/views_handler_field_math.inc

@@ -0,0 +1,73 @@
+<?php
+/**
+ * Render a mathematical expression as a numeric value
+ *
+ * Definition terms:
+ * - float: If true this field contains a decimal value. If unset this field
+ *          will be assumed to be integer.
+ *
+ * @ingroup views_field_handlers
+ */
+class views_handler_field_math extends views_handler_field_numeric {
+  function option_definition() {
+    $options = parent::option_definition();
+    $options['expression'] = array('default' => '');
+
+    return $options;
+  }
+
+  function options_form(&$form, &$form_state) {
+    $form['expression'] = array(
+      '#type' => 'textarea',
+      '#title' => t('Expression'),
+      '#description' => t('Enter mathematical expressions such as 2 + 2 or sqrt(5). You my assign variables and create mathematical functions and evaluate them. Use the ; to separate these. For example: f(x) = x + 2; f(2).'),
+      '#default_value' => $this->options['expression'],
+    );
+
+    // Create a place for the help
+    $form['expression_help'] = array();
+    parent::options_form($form, $form_state);
+
+    // Then move the existing help:
+    $form['expression_help'] = $form['alter']['help'];
+    unset($form['expression_help']['#dependency']);
+    unset($form['expression_help']['#process']);
+    unset($form['alter']['help']);
+  }
+
+  function render($values) {
+    ctools_include('math-expr');
+    $value = strtr($this->options['expression'], $this->get_render_tokens(array()));
+    $expressions = explode(';', $value);
+    $math = new ctools_math_expr;
+    foreach ($expressions as $expression) {
+      if ($expression !== '') {
+        $value = $math->evaluate($expression);
+      }
+    }
+
+    // The rest is directly from views_handler_field_numeric but because it
+    // does not allow the value to be passed in, it is copied.
+    if (!empty($this->options['set_precision'])) {
+      $value = number_format($value, $this->options['precision'], $this->options['decimal'], $this->options['separator']);
+    }
+    else {
+      $remainder = abs($value) - intval(abs($value));
+      $value = $value > 0 ? floor($value) : ceil($value);
+      $value = number_format($value, 0, '', $this->options['separator']);
+      if ($remainder) {
+        // The substr may not be locale safe.
+        $value .= $this->options['decimal'] . substr($remainder, 2);
+      }
+    }
+
+    // Check to see if hiding should happen before adding prefix and suffix.
+    if ($this->options['hide_empty'] && empty($value) && ($value !== 0 || $this->options['empty_zero'])) {
+      return '';
+    }
+
+    return check_plain($this->options['prefix'] . $value . $this->options['suffix']);
+  }
+
+  function query() { }
+}